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Ozuku Karasu as in picture above
Super hard stone the hardest i have ! I only use it for western razors razors, it is so hard , i ones tryde to make microbevel on Yanagi with it and it chipped the edge very badly, like 2-3 mm chips

Nartuaki Karasu Momiji Suita
Hehe very long name but true, that stone have almost all appearances in it, in the middle layer of the stone there are 20mm very dark layer of Karasu so with time it will be very hard stone, but now it is very good stone for knives. Also line is not toxic or can not be field.

Of coars my Aizu:
These stones are instinct, can not find them anymore Very hard Aoto like stones, super fast also on some very hard steels.

Ozuku set, Very old Ozukus one medium one is hard, they come from behind Ozuku from Another opening then reguler used in Ozuku stones

Old Takashima Kiita, you cant get them anymore in that sizes or that uniform it is 300 mm x 90mm stone
It is quite hard for Takashima and have very nice black Nashiji, no lines or any inclusions at all and layer very very uniform

My Hakka that i recived like that

Then i glued it up and still use it, works very good !!

Ozuku Karasu
Got is as gift in Japan, very hard and fine stone

Tenjyou Ozuku Sunashi
Very shallow layer stone but still super hard and fine, very unique and rare. I had to press 2 month to they will sell it to me haha ..
My stone dealer have only seen 2 of those ever

Nakayama Maruka Kiita Kan
In Old Maruka box have very nice Kan on sides very nice stone for knives